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Share Repurchase Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Total cost			$ 159,224
Share repurchase program
Equity, Class of Treasury Stock [Line Items]
Number of common shares repurchased and subsequently retired	3,083,201	1,000,000	8,092,906	1,324,700
Total cost	$ 66,533	$ 35,083	$ 157,044	$ 45,787
Average cost per share, including commissions	$ 21.58	$ 35.08	$ 19.41	$ 34.56

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Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Total cost of shares repurchased divided by the total number of shares repurchased.

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